How fast did you manage to learn Python?

[perfringo]

I would put in wider context:

But I would like to say a few things about what programming languages mean to the people who use them — programmers. Typically when you ask a programmer to explain to a lay person what a programming language is, they will say that it is how you tell a computer what to do. But if that was all, why would they be so passionate about programming languages when they talk among themselves?

In reality, programming languages are how programmers express and communicate ideas — and the audience for those ideas is other programmers, not computers. The reason: the computer can take care of itself, but programmers are always working with other programmers, and poorly communicated ideas can cause expensive flops. In fact, ideas expressed in a programming language also often reach the end users of the program — people who will never read or even know about the program, but who nevertheless are affected by it.

Think of the incredible success of companies like Google or Facebook. At the core of these are ideas — ideas about what computers can do for people. To be effective, an idea must be expressed as a computer program, using a programming language. The language that is best to express an idea will give the team using that language a key advantage, because it gives the team members — people! — clarity about that idea. The ideas underlying Google and Facebook couldn't be more different, and indeed these companies' favorite programming languages are at opposite ends of the spectrum of programming language design. And that’s exactly my point.

True story: The first version of Google was written in Python. The reason: Python was the right language to express the original ideas that Larry Page and Sergey Brin had about how to index the web and organize search results. And they could run their ideas on a computer, too!

This is exerpt form Guidos King's Day speech

For me it means that if you can express your ideas in Python then you have learned it. If you are not able to express your ideas this can mean (a) you have not learned Python yet (b) Python is not suitable language to express your ideas